Questions below are based on the following information. Circadian rhythms drive human and animal behaviors, such as activity, sleep, metabolism, and mating. A scientist hypothesizes that exposure to light and dark regulate these rhythms by altering the production of a hormone called melatonin. To evaluate the importance of light and dark in regulating circadian rhythms, the scientist conducts a set of experiments. Experiment 1 Over the course of one week, the scientist encloses three mice and exposes them to 24-hour periods of varying exposure to light and dark. During each 24-hour... Show more Questions below are based on the following information. Circadian rhythms drive human and animal behaviors, such as activity, sleep, metabolism, and mating. A scientist hypothesizes that exposure to light and dark regulate these rhythms by altering the production of a hormone called melatonin. To evaluate the importance of light and dark in regulating circadian rhythms, the scientist conducts a set of experiments. Experiment 1 Over the course of one week, the scientist encloses three mice and exposes them to 24-hour periods of varying exposure to light and dark. During each 24-hour period, the mice receive 12 consecutive hours of artificial light and 12 consecutive hours of complete darkness. At 15-minute intervals, the scientist notes the activity levels of the mice and records his findings. Furthermore, every 15 minutes during Day 7, the scientist collects a small blood sample from the mice to measure their level of melatonin. At the end of one week, the scientist graphs the mice’s activity levels in Figure 1, with black bars indicating the periods of continuous activity. The scientist then graphs the mice’s levels of melatonin as shown in Figure 2. Experiment 2 The scientist then conducts a similar experiment in which he studies the activity levels of mice exposed only to darkness over the course of one week. Figure 3 graphs the mice’s resulting activity levels, and Figure 2 records their melatonin levels on Day 7. Show less
Questions below are based on the following information.
Circadian rhythms drive human and animal behaviors, such as activity, sleep, metabolism, and mating. A scientist hypothesizes that exposure to light and dark regulate these rhythms by altering the production of a hormone called melatonin. To evaluate the importance of light and dark in regulating circadian rhythms, the scientist conducts a set of experiments.
Experiment 1 Over the course of one week, the scientist encloses three mice and exposes them to 24-hour periods of varying exposure to light and dark. During each 24-hour period, the mice receive 12 consecutive hours of artificial light and 12 consecutive hours of complete darkness. At 15-minute intervals, the scientist notes the activity levels of the mice and records his findings. Furthermore, every 15 minutes during Day 7, the scientist collects a small blood sample from the mice to measure their level of melatonin. At the end of one week, the scientist graphs the mice’s activity levels in Figure 1, with black bars indicating the periods of continuous activity. The scientist then graphs the mice’s levels of melatonin as shown in Figure 2.
Experiment 2
The scientist then conducts a similar experiment in which he studies the activity levels of mice exposed only to darkness over the course of one week. Figure 3 graphs the mice’s resulting activity levels, and Figure 2 records their melatonin levels on Day 7.
Join 4M+ learners. Unlock unlimited quizzes, wrong-answer tracking, flashcards + reminders, study guides, and 1-on-1 challenges.